How can anyone help you when you wont help yourself? You admit that they behaved badly towards you even after the birth of your son. Yet you are so enamoured of your wife that you got her pregnant again in 6 months time. And now you are crying about them threatening you about cases.
Buddy, there is more to this story than you are telling us. If you expect free advise and help, the least you owe in return is honesty. Get real buddy, be honest and it will help you to fight this mess. Lie and you are going to bear the rap, not any of us.